Sliding Wear of Hybrid Kevlar/Polytetrafluroethylene Fabric Composite Filled with Nano-Al2O3 and Expanded Graphite
The hybrid Kevlar/PTFE (polytetrafluroethylene) fabric composites filled with different content nanoparticles of nano-Al2O3 and expanded graphite, were respectively prepared by impregnating of Kevlar/PTFE fabric in phenolic resin containing nano-Al2O3 and expanded graphite to be incorporated and the successive curing. To determine the tribological properties of these composites, the hybrid Kevlar/PTFE fabric composites filled with nano-Al2O3 and expanded graphite dry-sliding against 45 steel were respectively performed on block-on-ring friction and wear tester. Scanning electron microscopy (SEM) was utilized to examine the morphologies of worn surfaces of the composites, to study modes of failure and the mechanism of the effects of the additives on the wear of the composites. The experiments results show that: the addition of nano-Al2O3 at a proper content resin can improve the wear resistance of the composite, but increased the friction coefficient; the addition of expanded graphite can not improve the wear resistance obviously, and has no effect on the friction coefficient; the optimum mass fraction of nano-Al2O3 and expanded graphite in the resin is respectively 1%; With the increase of the content of nano-Al2O3 and expanded graphite in the matrix resin, the wear resistance of composites decrease dramatically, which may be due to the agglomeration of the additives in the matrix resin. The SEM observation on the worn surface morphology indicates that microcutting, plastic deformation and fibers-matrix debonding are the main wear mechanism of the fabric composites under dry-sliding.
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Document Type: Research Article
Publication date: September 1, 2012
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